This is cool, I thought of something similar, didnt know someone implemented it and the swizz like bank note design is neat. but its still has flaws imo and ju

This is cool, I thought of something similar, didnt know someone implemented it and the swizz like bank note design is neat. but its still has flaws imo and just makes it a novelty rather than something practical or useful, for example unless the vendor has change, you would have to spend your btc cash denomination as a whole or exchange it for fiat. what if both the vendor & customer didn't have internet access, how would they check if the cash hasn't been used? idk if you can write back to an rfid that may solve some problems